One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10)(11,15)(12,13)(14,16)(17,18,23,28)(19,30,33,25)(20,34,38,45)(21,40,32,42)(22,29,24,27)(26,39,44,37)(31,43,47,48)(35,41,36,46)(2,6)(7,8)(9,10)(11,14)(12,13)(15,16)(17,19,23,33)(18,25,28,30)(20,35,38,36)(21,22,32,24)(26,43,44,48)(27,42,29,40)(31,37,47,39)(34,46,45,41)(10,13)(14,15)(17,20,24,39,23,38,22,37)(18,26,29,45,28,44,27,34)(19,31,32,35,33,47,21,36)(25,41,42,43,30,46,40,48)(1,3,5,4)(2,7,6,8)(9,11,12,16)(10,14,13,15)(17,21,24,19,23,32,22,33)(18,25,29,42,28,30,27,40)(20,36,39,31,38,35,37,47)(26,41,45,43,44,46,34,48)(1,4,5,3)(2,7,6,8)(17,22,23,24)(18,27,28,29)(19,32,33,21)(20,37,38,39)(25,42,30,40)(26,34,44,45)(31,35,47,36)(41,43,46,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.